Found this on Behance, thought it was actually really nice:

http://www.behance.net/gallery/16432355/iStock-rebrand-concept

More of a site redesign than a total rebrand, but still really good. It would be great to see iStock (or any company) start to move in this more clean design direction. Simplified, focused on the imagery, etc.

This is just a concept/experiment, but maybe the folks in Calgary will give this guy a call.